The US Supreme Court suggested it’s likely to uphold laws that ban gender-affirming treatments for minors as the justices considered a case that could determine the rights of transgender children in two dozen states.

In the biggest case of the term, the justices considered a challenge to Tennessee’s law banning certain gender transition medical treatments for minors.

Justice Samuel Alito grilled ACLU attorney Chase Strangio, the first-ever openly trans attorney to present at the high court, to repeatedly cast doubt on whether being transgender is “immutable” and thus protected by anti-discrimination laws.